a>span,
.non {
    position: relative;
    font-weight: 600;
    text-decoration: none;
    color: rgba(0, 0, 0, 0.4);
    transition: color .3s ease;
    width: 136px;
    height: 16px;
    text-align: center;
}

a>span::after,
.non::after {
    --scale: 0;
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    height: 3px;
    background: #4c81c9;
    -webkit-transform: scaleX(var(--scale));
    transform: scaleX(var(--scale));
    -webkit-transform-origin: var(--x) 50%;
    transform-origin: var(--x) 50%;
    transition: -webkit-transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1);
    transition: transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1);
    transition: transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1), -webkit-transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1);
}

a>span:hover,
.non:hover {
    color: #4c81c9;
}

a>span:hover::after,
.non:hover::after {
    --scale: 1;
}